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參數(shù)資料
| 型號： | TPA2008D2PWPG4 |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 5/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 3W STER 24TSSOP |
| 標準包裝： | 60 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 3W x 2 @ 3 歐姆 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 特點： | 消除爆音，差分輸入，短路和熱保護，關(guān)機，音量控制 |
| 安裝類型： | 表面貼裝 |
| 供應商設(shè)備封裝： | 24-HTSSOP |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm）裸露焊盤 |
| 包裝： | 管件 |
| 配用： | 296-18922-ND - EVAL MODULE FOR TPA2008D2 |
www.ti.com
TPA2008D2 MODULATION SCHEME
0 V
5 V
+5 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
0 V
5 V
+5 V
Current
OUTP
OUTN
Differential
Voltage
Across
Load
Output = 0 V
Output > 0 V
EFFICIENCY: LC FILTER REQUIRED WITH THE TRADITIONAL CLASS-D MODULATION SCHEME
TPA2008D2
SLOS413C – JULY 2003 – REVISED MAY 2004
APPLICATION INFORMATION (continued)
The TPA2008D2 uses a modulation scheme that still has each output switching from 0 to the supply voltage.
However, OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater
than 50% and OUTN is less than 50% for positive output voltages. The duty cycle of OUTP is less than 50% and
OUTN is greater than 50% for negative output voltages. The voltage across the load sits at 0 V throughout most
of the switching period, greatly reducing the switching current, which reduces any I2R losses in the load.
Figure 15. The TPA2008D2 Output Voltage and Current Waveforms Into an Inductive Load
The main reason that the traditional class-D amplifier needs an output filter is that the switching waveform results
in maximum current flow. This causes more loss in the load, which causes lower efficiency. The ripple current is
large for the traditional modulation scheme, because the ripple current is proportional to voltage multiplied by the
time at that voltage. The differential voltage swing is 2
× V
DD, and the time at each voltage is half the period for
the traditional modulation scheme. An ideal LC filter is needed to store the ripple current from each half cycle for
the next half cycle, while any resistance causes power dissipation. The speaker is both resistive and reactive,
whereas an LC filter is almost purely reactive.
The TPA2008D2 modulation scheme has very little loss in the load without a filter because the pulses are very
short and the change in voltage is VDD instead of 2 × VDD. As the output power increases, the pulses widen,
making the ripple current larger. Ripple current could be filtered with an LC filter for increased efficiency, but for
most applications the filter is not needed.
An LC filter with a cutoff frequency less than the class-D switching frequency allows the switching current to flow
through the filter instead of the load. The filter has less resistance than the speaker, which results in less power
dissipation, therefore increasing efficiency.
13
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|---|---|
| TPA2008D2PWPR | 功能描述:音頻放大器 Stereo Hi-Pwr 5-V Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2008D2PWPRG4 | 功能描述:音頻放大器 Stereo Hi-Pwr 5-V Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA200RL | 功能描述:TVS 二極管 - 瞬態(tài)電壓抑制器 200V 50uA Bidirect RoHS:否 制造商:Vishay Semiconductors 極性:Bidirectional 工作電壓: 擊穿電壓:58.9 V 鉗位電壓:77.4 V 峰值浪涌電流:38.8 A 系列: 封裝 / 箱體:DO-214AB 最小工作溫度:- 55 C 最大工作溫度:+ 150 C |
| TPA2010 | 制造商:TI 功能描述:2.5-W high efficiency filter-free class-D audio power amplifier |
| TPA2010D1 | 制造商:Texas Instruments 功能描述:Audio Amp Mono 2.5W Class-D TPA2010D1 制造商:TI 功能描述:2.5-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
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